I have a triac that interfaces a PIC output (ttl) to a bayonet 240v AC bulb...isolated by opto-isolater... but what if the bulb blows, or the bulb is removed, i would like to detect this and i know that in these instances, no current will flow so id need a sort of meter to detect current, not accurate measurement just whether CURRENT DRAW or NO CURRENT DRAW, and feed this back to my PIC as an input. Any ideas how i could go about this?